Electric glass-heating apparatus.



G. H HARVEY. A ELECTRIC GLASS HEATING APPARATUS.

APPLICATION FILED NOV. 23, 1906.

WAR eases METAL GeuxwRE-hfiey 5 b qhulunneg I PATENTED JULY 9 190 71 m L fau- GEORGE ll. HARVEY, F GLENFIELD, PENNSYLVANIIA, ASSIGNOR TO BROWNSVILLE GLASS COMPANY, 0F PITTSBURG, PENNSYLVANI A, A GORPORATION OF PENNSYLVANIA.

ELECTRIG GLASS-@ATING APPARATUS.

Specification of Letters Eatont.

Patented. July 9, 1,907.

Application filed November 23,1906. Serial 1%. sit-.751,

To all with-m it may con ern:

Be it known th T Grouch ll. .l'lAlt VlfiY, a citizen of the United rc ing at Glenficld, in the county of A legheny and State oi Pennsylvania, have 5 invented or l scovercd new and useful Improvements in Electric Gloss-floating Apparatus, of which the following is a specification.

My invention relates to apparatus for cylinders on a circu iierential line, w 'hich it is desired to crack the same, and its object is to provide for this purpose on electr i apparatus, which is capable of quick and easy adjustment and operation.

Referring to the drawing accompanying this specification, the figure represents in elevation one form of my invention In the drawing, 1 represents u, block of nonconducting material, which supports the two electric terminals 2 and 3, to which are secured the ends of the respective circuit wires 4 and 5 connected to a suitable source of electric encr y. Connected also to said terminals 2 and 3 which are insulated One from the other are the ends oi the re pective glassheating Wires 6 and 7 of hi gh resistance to the passage of electric current.

with end loops 8 and 9 which surround the terminals 2 and 3. From the loops 8 and 9 the wires 6 and 7 lead through the non-conducting guide 10, in which they are held out of electrical contact with each other and from which they curve in opposite directions around the glass cylinder 11, shown by a dotted line, The remaining ends of the Wires 6 and 7 cross each other opposite the block 1 and are, provided with the "insulating handles 12 and l; Preferably the handle 13 is weighted and the handle 12 provided with the eye 14, to which is connected the lower end of the swinging rope 15. This rope may be composed of elastic material or it may he or inelastic material socured to an elastic or yielding support.

In practice the wires (5 and 7 are passed around the cylinder 11 from opposite directions and brought into contact with the cylinder and each other and drawn tight by the operator by means of the handles 12 and 13, or the wire 7 may he supported by the rope 15 which inay be secured to the eye 14 for that pur- 4 pose, the Wire 6 being hold tight by the hanging weight 13. The electric current is then connected in any desired manner into circuit in hiding those portions of the Wires 6 and 7 which form a loop around the cylinder 11. The wires 6 and 7 being of high resistance to the current will heat rapidly and expand,

The wires 3 and 7 are provided the expansion being taken up by the rope 15 and the weight 13, thus holding the wires tightly against the cylinder and permitting the operator the full use of his hands tot-rack off the cylinder in the usual or any desired manner. The current which may be supposed to enter by the wire 4 passes to the terminal 2 and then along the Wire 6 to its junction with the wire 7 and thence along the latter to the terminal 3 and the return wire 5. The current travels the wires 6 and 7 seriallyor in series. Where the current is caused to brunch or travel the wires in parallel as has been proposed, doullle the current is required to secure the same heating effect, since the heating effect depends on the resistance of the wire, the current remaining the'same As the resistance to the current in the parallel ariungerueht of the wire is only half of what-it would be in a series arrangement thereof,

the heating effect is accordingly divided in half.

lt will be noted that applicant has but one gap in the continuity of the conductor around the glass, which lessens the breakage of the glass in comparison with conductors having a plurality of gaps. Wherever a gap exists in the conductor, there is a possibility that the glass will check or crack irregularly, or not along the'linc heated by the conductor. Applicant reduces this possibility to a minimum.

l. in an electric glass heating nppai-atus, twolwlres of high electrical resistance adapted to pass in opposite directions around a glass cylinder, and a terminal for one end 30 of each wire, the opposite ends of the wires being free and electrically connected, so that the electric current will traverse the wires in series.

2. In no elcctrlc glass heating apparatus, two wires 0! high electrical resistunce adapted to pass in opposite dlroc- B5 tlons around it glass cylinder, 21 terminzll for one end o eacirqvlre, the opposite ends of the wires being free and electrically connected, so that the electrlc current will traverse the wires in series, and means for taking up the expansion of the wires so as to maintain them in CGIItEiCt with the cylinder.

3. In an electric glass heating apparatus, two wires of high electrical resistance adapted to pass in opposite dlrectlons around a glass cylinder, :1 terminal for one end of each wire, and an Insulating handle for the ritecnd of one of said wiresfthe free ends of said wires being electrically connected so that the electric current will traverse the wires in series.

Signed at Plttsburg. Pa, this, 12th day of November, 1906.

GEORGE H. HARVEY.

Witnesses F. N. 'BAnBER, C. E. Eccnns. 

